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12-02-2008, 10:17 AM   #1
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Takumar 35/2

i know that some Takumar (m42) lens are radioactive.

question:
- is Takumar 35/2 radioactive?
- is Super Takumar 35/2 radioactive?
- is Super-Multi-Coated Takumar 35/2 radioactive?
- is SMC Takumar 35/2 radioactive?

12-02-2008, 12:03 PM   #2
YJD
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What??? Serious?
12-02-2008, 12:07 PM   #3
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QuoteOriginally posted by YJD Quote
What??? Serious?
i read that some takumar (like SMC takumar 50 1.4) are radioactive.

and now i ask you if there is a list of radioactive takumar
12-02-2008, 12:15 PM   #4
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QuoteOriginally posted by platinum Quote
i read that some takumar (like SMC takumar 50 1.4) are radioactive.

and now i ask you if there is a list of radioactive takumar
I do not know of any "exhaustive list" but try this

Radioactive lenses - Camerapedia.org

Also I have read that yes the radio active glass can be dangerous, only if you eat it, and it is the broken glass not the radiation that kills you

12-02-2008, 12:31 PM   #5
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QuoteOriginally posted by Lowell Goudge Quote
I do not know of any "exhaustive list" but try this

Radioactive lenses - Camerapedia.org

Also I have read that yes the radio active glass can be dangerous, only if you eat it, and it is the broken glass not the radiation that kills you
Lowell Goudge, thansk for link but it is a very little list
12-02-2008, 12:37 PM   #6
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QuoteOriginally posted by YJD Quote
What??? Serious?
Yes, from the Thorium. Thorium was added to the glass of many high quality lenses. The upside to a radioactive lens is that it has a good chance of being very good. I would be concerned it if were the viewfinder.

Edit:
QuoteQuote:
SMC Takumar 50mm f1.4 (Asahi Optical Co.)

Super Takumar 35mm f2.0, 50mm f1.5, 55mm f2 (Asahi Optical Co.)

Super Takumar 6x7 105mm f2.4 (Asahi Optical Co.)

Super-multi-coated Macro-Takumar (Asahi Optical Co.)
These are from the ORAU site. Here is a link at the Oak Ridge Associated Universities site (affiliated with ORNL) http://www.orau.org/ptp/collection/consumer%20products/cameralens.htm


Edit: Edit: from Wikepedia
QuoteQuote:
Radiation Levels

Typical radiation levels can approach 1 mR/hr as measured at the lens element's surface, decreasing substantially with distance; at a distance of 3 ft. (.9 m.) the radiation level is difficult to detect over typical background levels. For reference, a typical chest x-ray consists of about about 10 mR, a round-trip cross country airline flight exposes a passenger to 5 mR, and a full set of dental x-rays exposes the patient to 10 mR to 40mR.
I generally don't lick, finger, or pulverize my lenses so I'm not too worried about it. In fact the mantels for gas lanterns have Thorium are far more radioactive and are used to calibrate Geiger counters in the field.

Last edited by Blue; 12-02-2008 at 12:47 PM.
12-02-2008, 03:42 PM   #7
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Blue, your link to ORAU site is very interesting.

very thanks :-)

--
copy\paste form
Thoriated Camera Lens (ca. 1970s)

"Camera lenses known to have contained thorium include:
...SMC Takumar 50mm f1.4 (Asahi Optical Co.)
Super Takumar 35mm f2.0, 50mm f1.5, 55mm f2 (Asahi Optical Co.)
Super Takumar 6x7 105mm f2.4 (Asahi Optical Co.)
Super-multi-coated Macro-Takumar (Asahi Optical Co.)..."
12-02-2008, 04:15 PM   #8
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All the lenses which show yellowing of the rear element are radioactive since they use a special glass (see blues post). I tested a smc Takumar 50/1.4 and a Geiger counter clearly responded. I have a Super Takumar 35/2 and it showed yellowing.
I don't think it is too dangerous as long as you don't put it under your pillow. There is a lot of other stuff which is radioactive: try the fluorescent indicators of a wristwatch, or a granite kitchen countertop.

12-02-2008, 04:37 PM   #9
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QuoteOriginally posted by chse Quote
All the lenses which show yellowing of the rear element are radioactive since they use a special glass (see blues post). I tested a smc Takumar 50/1.4 and a Geiger counter clearly responded. I have a Super Takumar 35/2 and it showed yellowing.
I don't think it is too dangerous as long as you don't put it under your pillow. There is a lot of other stuff which is radioactive: try the fluorescent indicators of a wristwatch, or a granite kitchen countertop.
also for your Super Takumar 35/2 the Geiger counter clearly responded?
12-02-2008, 06:35 PM   #10
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QuoteOriginally posted by Blue Quote
I generally don't lick, finger, or pulverize my lenses so I'm not too worried about it.
I have been known to smooch my SMC Tak 35mm f2 ... I just can't help it.

germar
12-03-2008, 09:34 AM   #11
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Volna-9 50/2.8

where i can find review about Volna-9 50/2.8 (m42)?

i try to find but i found nothing at the moment :-(



ps. sorry, i wanted to open a new thread

Last edited by platinum; 12-03-2008 at 10:10 AM.
12-03-2008, 09:49 AM   #12
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QuoteOriginally posted by platinum Quote
where i can find review about Volna-9 50/2.8 (m42)?

i try to find but i found nothing at the moment :-(

Volna 9 vs Industar 61 L/Z


KMZ Volna 9 50mm f/2.8-16.0 FM=23cm (Normal) #350 - M42


Volna-9 50mm f/2.8

Edit: here is some photo comparisons with similar lenses: http://www.fredmiranda.com/forum/topic/665563/

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/34920-volna-9-...kton-58mm.html

Last edited by Blue; 12-03-2008 at 09:56 AM.
12-03-2008, 10:08 AM   #13
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thanks for links, Blue :-)
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